In the translation I use (I'll link to it below), Kamala doesn't use the word "charmed" but claims that he has been "lucky."
“You've been lucky,” she said when they parted, “I'm opening one door after another for you. How does that
happen? Do you have a spell?” (25).
Siddhartha claims that, no, he isn't lucky, he's focused. He goes back to the skills learned as a Samana: he thinks, he waits, he fasts. Siddhartha says that when he has a goal, "he passes through the things of the world like a rock through water" (25).
Siddhartha later makes this same point again to Kamala through the analogy of a leaf. He says that most people are like a falling leaf that falls through the air to the ground, blown around by the wind and air. "But others, a few, are like stars: they go on a fixed course, no wind reaches them, and in themselves they have their law and their direction" (29).